重建系统演化树的一种新方法--试错法

重建系统演化树是进化研究的一个极为重要的方面。系统树的构建依赖于一定的方法和数据。在分子系统演化研究中，所使用的数据大多是ＤＮＡ序列、氨基酸序列和分子标记。而就构树方法来说，ＮＪ法、ＭＬ法和ＭＰ法是三种最为普遍使用的方法。本文给出了一种新的建树方法，即试错法。该方法不但具有与ＮＪ法一样好的建树效果，而且不存在难以解释的负枝长问题。

A NEW METHOD FOR RECONSTRUCTION OF PHYLOGENETICTREE:TRIAL ERROR METHOD

Reconstruction of phylogenetic tree of organisms is one of the most important problems in evolution study.Reconstruction of phylogenetic tree depends upon treemaking method and data set.The majority of data set used in molecular phylogenetic research comes from DNA and amino acid sequences and sometimes also molecular markers.As for treemaking methods,there are many treemaking methods,of which the NJ,ML,and MP methods are the most popular methods uded.In this paper,we proposed a new tree making method,called trial error(TE) method.This method not only has the same efficiency of producing trees as the NJ method but also does not produce the negative branch length in tree. Like the NJ tree, the TE tree is also an unrooted tree.